Coffee roasting apparatus



COFFEE ROASTING APPARATUS Filed March 3l, 1937 4 Sheets-Sheet l COFFEEROAST ING APPARATUS 4 sheets-sheet? Filed March 3l, 1937 .MH MN ow n@www k f fm www COFFEE RCIASTING APPARATUS Filed March 3l, 1937' 4Sheets-Sheet 3 Feb. 6, 1940. A. c. wALDvoGEL 2,188,969

' COFFEE ROASTINQAPPARATUS kwk 4 Sheets-Sheet 4 Filed March .'51, 1937/e w e a n Ww WW M y @Y m Patented Feb. 6, 1940 UNITED STATES PATENTfort-ICE 18 Claims. 4

This invention relatesto coffee roasting apparatus. p

Objects of the invention yare to provvide an improved coffee roastingapparatus comprising electrically controlled mechanisms operating in atimed sequential relationship for delivering measured charges of coffeefrom a hopper or receptacle into a receiver and thence into a rotaryroaster; to provide additional' mechanism controlling and effectingdischarge of the coffee from the roaster into a cooling compartmentthrough which a cooling draft of air is drawn to cool the roasted coffeewhile the coffee remains in said cooling compartment; to providemechanism for causing a draft of air through the cooling compartmentonly while the coifee f remains in the cooling compartment; to providemeans for discharging the coiee from the cooliing compartment into astoner or cleaning device and utilizing the aforesaid air draftmechanism to create a current or suction of air through the stoner orcleaner with suillcient force to raise the coffee to a desired heightand to discharge the coffee against the baille which deiiects the coffeeinto a discharge receptacle but permits the impurities, such as chaff,etc., to continue with the flow of the current of air to a discharge tothe air draft mechanism, which it is discharged to the outside or towaste; to provide automatic means forcontrolling the passage of a supplyof fuel to a burner adjacent to the roaster; to provide an additionalair draft mechanism for withdrawing air and the lighter particles ofwaste or'chaff from the roaster compartment in -which the Irotaryroaster is contained and to discharge the chaff into an appropriatereceptacle and the fumes to the outside; and to provide improved meansfor controlling a thermostatic valve that regulates the passage of fuelto the burner adjacent to or at the roaster.

Another object of the invention is to pro vide improved mechanismsoperating dependently and in a timed relationship so that the A machineor apparatus will operate with a very high degree of emciency and willcontinue to operate only while an appropriate amount of coffee iscontained in the supply hopper or receptacle and'will automatically stopand cease to operate when the supply hopper or receptacle becomesdepleted or contains less than the desired amount of green coffee.

Various other objects and advantages of this invention, which areattained by the mechanisms andl devices herein disclosed, and al1 offrom (Cl.V 34-5) which are considered of importance in this invention,will become readily apparent from the following description, referencebeing made to the annexed drawings, in which- Fig. 1 is a view withparts in section and parts in elevation and extended in offsetrelationship illustrating many of the important features of theinvention. 1

Fig. 2 is a view looking' toward the righthand side of Fig. l.

Fig. 3 is an enlarged detailed view showing the switch devicescontrolled in part by the coffee contained in the supply hopper orrecepta- -cle for energizing the electrical mechanism for operating themachine.

Fig. 4 is a view partly in section showing a. portion of the inventionillustrated in Fig. 1 but having a quantity of green coffee in thesupply hopper or receptacle preparatory for delivering a measuredquantity thereof into a receivingcompartmentfor delivery into theroaster, with other parts shown in position to discharge coffee from thecooling compartment into the stoner or cleaner.

Fig. 5' is a view similar to Fig. 4 showing the `parts in position fordischarging coffee from the receiving compartment into the roaster andfor supporting coffee in the cooling compartment.

Fig. 6 is a. view similar to Fig. 5 with the exception that therespective valves are shown in position to support coffee in thereceiving compartment. and to discharge coffee from the roaster into thecooling compartment and to support coffee in the cooling compartment.

Fig. 7 is a perspective view of a completed machine embodying thepresent invention.

Fig. 84 is a view partly in section showing butterily valves forcontrolling the suctionof air through the cooling' compartment and f/through the stoner or cleaner successively and alternately by the samemechanism.

Fig. 9 is an enlarged sectional view showing the device for controllingdischarge of measured quantities of coffee from the hopper orcontainerinto the receiving compartment preparatory for delivery intothe roaster.

Fig. 10 is a view partly in section showing de tails of the valvecontrolling discharge of cciee als rei

and that cooperates with the valve oi the receiving compartment todischarge coffee from the `nism and for timing the operation ofthedifierent devicesr comprised within the invention.

Fig. 18 is a view mostly diagrammatic illustrating the electricalconnections for operating the dierent devices in timed relationship, thevalve device controlling discharge of the coil'ce from the receptacle orhopper into the receiving compartment being seen from two positions forclarity.

Fig. 19 (Sheet 2) is a detail View showing the construction preventingthe lodgment of cofl'ee beans between the edge of the gate valve memberfor the roaster and the wall ofthe opening controlled by said gate valvemember when said gate valve member is swung from position to dischargeroasted coiee from the roaster.

Fig. 20 is a perspective view typically illustrating the connectionbetween the respective armatures and the levers operated thereby.

Most of thev present invention is enclosed within or supported by acasing I (Fig. '7) having a. hopper or receptacle 2 thereon to receivethe green coiee that is to be roasted, and also 'having at one side `areceptacle or bin 3 which.

receives the roasted and cleaned coee from a delivery chute 4 openingfrom within the casing i. The hopper or receptacle 2 has an inclined.

wall 5 which partly supports the cofl'ee in the hopper and which has anopening 8 therethrough (Fiss. 2 and 3). A plate 'I is'provided to closesaid opening and has its upper end mounted on a pivot 8 so that saidplate may swing upwardly to the position shown in Fig. 1 when the hopper2 is empty and downwardly to the position shown in Fig. 4 when thehopper 2 contains a considerable amount of coilee. The edges of saidplate 1 are connected with the wall 5 by exible fabric 9 or the like,which does not interfere with the swinging movements of the plate l butprevents coffee beans and the like from becoming wedged or lodgedbetween the edges of the plate I and the bottom wall 5, and alsoprevents the coiIee beans from dropping through the opening 8. Anangular lever I has one end attached to the underside of the plate l andits opposite end supporting a counter- Weight iI. The lever I0 engages apart I2 mounted on a pivoted frame I3 supporting a. pair of mercuryswitches I4 and I5.

When the hopper 2 contains no colTee to be roasted or has become empty,or approximately empty, the switch actuator comprising the lever It andthe oounterweight II turns the frame I3 to position to open both mercuryswitches I4 and l, as shown in Fig. 1. When the plate 'I is de' pressedfrom the position shown in Fig. 1 to the position shown in Fig. 4 underthe weight of the ooiee contained in the hopper 2, the lever I 0 ismoved from the position shown in Fig. 1 to the position shown in Fig. 4,so that the frame i3 may be turned to close the switches I4 and Y i5without resistance by the lever I0.

A rod I6 is supported for rocking movements by vlugs Il attached to thebottom Wall 5 of the hopper, and has attached thereto an arm 4 is at oneside of the part I2 and an arm I9 at the opposite side of said part I2.The rod I6 extends adjacent to or through one Walll of the hoppersupportlnglstructure and has a p0rtion 2I (Fig. 3) formed to be engagedby n, key v or the like, whereby the rod I6 maybe turned to operate thepart i2 and thereby swing the frame I3 from a position in which theswitches I4 and I5 are open to position in which said I switches areclosed, and vice versa. It is neces' sary to close the switches I4 andIlinorder tn operate the machine. y

v An inlet chute 22 from the hopper 2 opens into I a receivingcompartment 23 into which measured 10 amounts of 'green vcoil'ee aredeliveredat inn tervals and from lwhich said measured amounts of.-

gre'en' coffee are discharged at intervals automatically duringoperation oi' the machine while the switches u and is remainciosed. Aplate u 11s,;y

supported by one wall of the chute 22 (Figs. 1 and 9) and which isremovable and replaceable, constitutes a device regulating the capacityof the compartment 23. Thus, Iit it is desired to increase the capacityof thecompartment 23, 26

the specic plate 24 shown in the drawings may4 be removed and anotherplate of less length than the plate 24 and extending av lesser distanceyinto the compartment 23 may be substituted therefor; and, if it isdesired to reduce the 85j capacity of the compartment 23, a longer platemay be substituted for the plate 24. The capacity of the compartment 23may be regulated l in this way because .no substantial amount'oi' coffeewill rise behind the plate 24, which is to 3Q say between said plate andthe adjacent wall of the compartment 23.

yThe chute 22 is opened andfclosed by agate or valve device comprising aseries of Vrods 25 (Figs. 4 and 9) extending through one wall ofthe 35chute 22 acrosssaid chute toward the opposite wall and terminating undera shoulder or ledge 26 having a horizontal underside and a downwardlyand inwardly inclined upper wall. The

- inner ends 21 of the rods 25 are` pointed so that 40" no coil'ee beanscan become lodged'between the ends of said rods and the wall of thechute ad# jacent to which said rods terminate, because the pointed ends21 cooperate withthe shomder ze Y to prevent such lodgment of the coiIeebeans.` 45.

The outer ends of the rods 25 extend through holes in the wall of the`chute and are attached to a cross-head 28 havingV an arm 29 pivotedto,v an extended portion of an armature 30 of an v electromagnet 3i. A-yoke 32 (Fig. 18) is at-150 tached to the outer end 'of thev magnet3i." Two I .A t

rods 33 are xedin supports 34 and have their outer endsi extendingthrough the 'yoke 32., Springs 35 encircle the rods 33 and have theirouter ends abutting against the yoke their inner ends abutting. againstvthe crosshead 28, so that the energyoi' said springs is` t exerted tomove the cross-head 23, and thereby the armature 30, inwardly inopposition to the energy of the electro-magnetl 3 I tro-magnet 3I isenergized, it moves the armature 30- outwardly and thereby moves therods 25 outwardly to open position. And, when the electro-magnet iii iscie-energized, the springs as move the cross-head as and rods 2sinwardly u,

32 and e when the elec- .s

the compartment 23 (Figs. 4 and 6) to position to open said compartment23 (Figs. l and v5). In.y the closed position (Flgs.'4 and 6) themeasured amount o! coffee delivered into and received.

within the compartment 23jwill be supported in said compartment b'y thegate or valve 38; and, whenthe gate or valve 36 is moved from the closedposition shown in Figs. 4 and 6 to the open position shown in Figs. land 5,'the coilee.

may DSs from the compartment 23 through the space provided by opening ofthe gate or valve 36 into a rotary roaster 38. n

One end of the gate or valve 33 is attached to a rocking rod 38 at theinclined wall 48 of the compartment 23, so that, when said gate or valveswings downwardly, it is in approximate continuation of the inclinedwall 40, thereby permittingthe coilee to slide along the wall 40 andthrough the opening provided by the gate or valve 38 and thence into therotary roaster 38. An arm 4IV projecting from the rocking rod 38 isengaged by the armature 42 oi' an electro-magnet 43 so that,.when theelectro-magnet 43 is deenerglzed and the armature 42 moves downwardlyagainst the arm 4|, it will support the valve 36 in closed position(Figs. 4 and 6); and, when the electro-magnet 43 is energized, whichoccurs at the proper time to deliver an additional charge or quantity-oigreen coil'ee into the roaster 38, the armature 42 will move said lgateor valve to open inclined position (Figs. 1 and 5), and thereby permitthe coii'ee to ilow into the roaster.

The gate or valve 36 has an upwardly extended side wall 44 attached toor integral with each? side edge thereof (Figs. 10 Aand 11) andoperatingbetween plates 45 attached to the side walls 46 of the compartment 23,so that it is impossible for any of the coffee beans to become lodged orwedged between the gate or valve 36 and adjacent parts and therebyinterferefwith or prevent effective operation of said gate or valve.When the gate or valve is swung downwardly, these side walls 44 guidethe flowing coifee beans between them.

A gate valve-member 41 is attached to a rocking rod 48 mounted instationary supports across the lower side of the inlet 48 into theroaster 38.

The rocking rod 48 is adapted to be turned to three diilerent positionsand thereby move the gate valve member 41 to threediiferent positions.The gate valve member 41 is; shown in its inter-4 mediate position' inFig. 4', and it occupies this position during the time thatl a charge ofcoffee withinthe roaster 38 is being roasted. After the coiTee has beenretained in the rotary roaster 38 and roasted the proper length of time,the rod 48 is operated to swing the gate valve member 41 laterally to aninclined position in which it extends through the inlet 48 into theroaster 33. The flights 58 attached to the inside of the roaster arearranged and inclined in such a manner that they will discharge thecoiIee from the roaster onto the inclined gate valve member 41 andthence through the inlet 48, which is now utilized as an outlet for theroasted coil'ee. The

coffee then moves downwardly along an inclined wall 5I into a coolingcompartment 52 having opposite side walls 53 and 54 of screen materialor the like through which air may be drawn or cooling compartment,

Aitertheroasted vcoiee has been discharged from the rotary roaster 38,the gate valve member 41r is swung in the opposite direction to theforced to cool .the coil'eesupported within the inclined position shownin Fig. 5, in which it isv is closed and therod 48 is turned to move themember 41 to vertical position across the opening 4.8 (Fig. 4) toprevent coffee contained in the roaster from being discharged therefromuntil it has been roasted. v f

When the gate valve member 41 is operated in? the manner described, itisfdesirable to prevent any of the coffee beans from becoming lodgedbetween the far edge of said gate valve member as seen in Fig. 19 andthe marginal portion 41' .of the opening controlled by said gate valvemember. For this purpose,y I provide a flange 48' with a sharp upperedge so that no coffee beans can `become lodged on said flange. Thisflange is integral or rigid with the marginal portion of the gate valvemember 41 close to the margin 41 of the opening controlled by said gatevalve member. Thus, the Alange. 48 makes `it impossible for any coffeebean or beans to become lodged at .the corner formed by-the gate valvemember 41 and Athe margin 41 of the opening when said gate valve memberis inclined into the roaster, as shown inFIg. 19. Thus. proper operationoi' the gate valve member is Pssured.

The mechanism for rocking the rod 48 comprises gearing and operatingdevices therefor. As shown (Figs. 12, and 13)., a pinion 55 is looselyand adjustably mounted on the rod 48. An arm 56 is loosely mounted on.the rod 48 at the side oi.' the pinion 65. Al set screw 51 is screwedthrough the arm 56 into clamping engagement with the rod S8. so that thearm 56 may be rigidly attached to the rod. A bolt 58 passes through ahole in the pinion and through a slotiifi in the arm 68, and has a nut60 screwed on the end thereof. By loosening the nut 60 the rod 48. andthereby the valve member 41, ymay be turned to any desired adjustedposition with respect to the pinion 55. and vice versa:` and the nut maythen be tightened to secure the parts rigidly in such ad? justedposition.

A' rack 6I mounted on. anti-friction supports 62 is operated to, turn.the pinion 55 and tbe rod il to movethe member 41 tn its threediii'erentl posi-` tions before indicated. The gearing as shown in Fig.12 is in its intermediate position andholds the member 48 in itsintermediate position shown in Fig. 4 durlngthe time that the coffee lsseme' retained in the roaster and is being roasted. After the coil'eehas been roasted the desired time, an electromagnet 63 is energized andactie ates its armature'` 64, which is pivoted to the adjacent end ofthe rack 6|. thereby moving the rack and turning the rod 48` to swingthe member v41 laterally to the position in which its extends 1 Ias theroasted coffee has been discharged from the roaster, the magnet 63 isde-energized and another electromagnet 65 is energized and moves itsarmature 66 which is pivotally connected with the rack 8| Thereby therack 6I is moved in the opposite direction from the direction in whichit had been moved by the armature 63 and operates the rod 48 to swingthe member 41 out-A wardly and to the inclined position shown in Fig.rv5 preparatory for opening of the valve member 36. These parts are'operated in timed relationship, and at the proper time theA valve member3,6 is swung downwardly to cause another charge of green coffee to iiowinto the roaster 38.

The lower end of the cooling chamber 521is open, but may be closed by amovable wall 61 supported by a lever 68 mounted on a pivot 69. Anelectro-magnet 10 has an armature 'H which engages the lever 68. Whenthe electro-magnet 10 is de-energized, the armature 1l moves downwardlyand operates the lever 68 to move the wall 61 from open position (Fig.4) to closed` position (Figs. 5 and 6). vThe electro-magnet 10 isenergized intermittently. It is de-energized before roasted coilee isdischarged from the rotary roaster 38 in the manner described, and

thereby moves the wall 61 to closed position at the lower end of thecooling compartment 52 (Fig. 6) and holds said wall-in said closedpositiona desired length o1' time whiler a current ofv cooling air isbeing drawn through thel wall 53 and through the coilee in the coolingchamber 52 and through the wall 54 into a passage 12 opening into ablower 13 having a discharge outlet 14 through which the air drawn intothe blower is discharged.

When the wall 61 'is opened as explained, the boasted and cooled coil'eedrops from the cooling chamber 52 into a stoner chamber 15 which has ascreen cup 16. A pipe 11 extends downwardly into the chamber 15 and hasits lower end opening into said chamber immediately above the screenbottom wall of the cup 16. The cup 16 is supported by a hinge 16 and aconventional latch 11'. The pipe 11 extends upwardly through a chamber18 and has its upper end open within a compartment 19 supported by andopening downwardly into the chamber 18. A bell-shaped baie 88 issupported limmediately above the open l upper end of the pipe 11 by anappropriate supa port 8l (Fig. 1) extending into the compartment 19. Thebell-shaped baille 88 is of larger diameter than the diameter of thepipe 11 and is of less diameter than the inside diameter of thecompartment 19 so that said baille and the wall of said compartmentcooperate to form an annular space around the baille and into the upperportion of the compartment 19 which open into a pipe 82 extendingdownwardly and opening into the blower 13. A valve 83 is supported bythe upper end of a stem 84 the lower end oi' which is attached to arocking rod extending across the passage from the pipes 12 and 82 intothe blower 13. An electro-magnet 86 Vhas its arma-. ture 81 providedwith a pivotal 'and sliding connection 81', with a 1ever88 attached tothe rod 85 so as to rock said rod far enough to move the valve 83 fromposition to close the pipe 12 (Fig. 4) to position to close the pipe 82.(Figs. 5v andf) add vice versa. A counterweight 88 on the lever '88cooperates '-.vith the armature 81 to move the valve 83 from the pipe 12to the pipe 82 when the electro-magnet 86 is deenergized. 'I'heelectro-magnet 86 remains de-energizedL during the entire time thatroasted coiTee is supported in the cooling compartment 52 by the waf'61;and the electro-magnet 86 is energized simultaneously with theenergizing of themagnet 10, s" that the pipe 82 is opened and the pipe12 is clo` ed simul- A taneously with the opening of the closure wall 61at the lower end of the cooling compartment 52. Obviously, then, theblower 13 will create a sucl tion through the pipe 82 and thence throughthe pipe 11 from the stoner compartment 15 and will raise the roastedcooled coffee through the pipe 11 and discharge the same againstthebaille 80. The cooled co'ee will then dro'p' into the chamber 18 whilethe air and cha will drawn by suction through the pipe 82 and dischargedby the blower .through the outlet 14. This leaves the heavier partieiesand stones mtheigemovabie e screen cup 16 vat the bottom of the stonercompartment 15.

In proper timed relationship to the `intlivemient oi the wall 61 to openposition (Figyir, which permits the'cool roasted coffee to dro'pi' or.ow

from the cooling chamber 52 into thegstoner 15.k the electro-magnet 86is energized and' t rod 85 to position to swing the valve 83 from the Ipipe 82 to position to close the pipe 12 (Fig. 4).

thus opening the pipe 82 so that the continuously f operating blower 13will create a strong suction through the pipe 11 and will raise thecoffee from the stoner chamber 15 through said pipe 11 and discharge thecoffee against the bell-shaped baille 3'0v 80 (Fig. 1), which deflectsthe coffee downwardly into the chamber 18 while theair and any re-vmaining light waste matter. such as cha, will be drawn through the pipe82 by the continuously operating blower and discharged through theoutlet 14.

The cooled and cleaned roasted coieewiil supported in the chamber 18 bya movableI closure wall (Fig. 1) for the bottom of said chamber, whichis supported by a lever 9i mounted on a rod 92 and actuated to closedposition by a counterweight 83 attached to said lever and by the suctionof air as described. After the charge or batch of cleaned and'cooledroasted coiee has f been delivered into the chamber 18 in this" maniner, and after the pipe 82 has been closed by the valve 83 and suctionthrough the pipe 82 has ceased, the closure wall 90 will operate by theweight oi the coffee to open the lowerv end of 4the chamber 18 and causethe coffee to pass or flow from the chamber 18 into the discharge chute4 and thence into the receptacle or bin 8. A typical connection of thevarious armatures n hereinbefore mentioned, with the arms or leverscontrolled thereby, is illustrated in detail. in Fig. 20. As thereshown, anr electro-magnet 86' operates in one direction an armature 81'when said magnet is energized.Y A lever 88' has thereon a counterweight89 and extends for sliding movements through a member 90 rotativelysupported by the armature 81'. Thus, when the armature 81' movesupwardly and downwardly, the arm or lever 88' will be oscillated therebyand will slide through the rocking, member 98', as required in suchmovements. This typically illustrates the connection of the variousarmatures with the parts controlled thereby.

'I'he roaster 38 is-rotatively lsupported 'at its open end by a bearing94 and at the opposite end Y by an axle member 95 journalled in the wall96 of a part of the housing or casing that encloses i the roaster. A A

The axle member 95, and thereby the roaster, is rotated by a sprocketorgearing connections 81v driven by conventional gearing operated by aconventional electric motor 22. The shaft l2 y receptacle |04 oppositethe open end of the pipe |02 and has a bame |05 in the receptacle |04below and spaced from the lower open end of the pipe Ill in thereceptacle |04. Thus, the air and chai! are driven into the receptacle|04 spirally and are circulated therein in a cyclonic manner, causingthe air .and -fumes to enter the pipe while the baille |06 causes thechai! to drop and settle into the bottom portion |01 of thel receptacle|04. The fumes-are discharged to the outside through the pipe while thechail is retained in the lower end portion |01 of the receptacle, whichmay be opened from time to time to remove and dispense with the chai!and waste.

A burner |22 is mounted in the roaster compartment below the rotaryroaster 22 and receives gas through an airmixer tube |00. A gas supplypipe l|0 opens through an air mixer into thev tube |00 and is equippedwith an adjustable valve ||2 to regulate the amount of gas passing fromthe pipe ||0 into the tube |00. 'I'he pipe ||0 receives gas from asource of supply through a thermostatic valve ||2 to which is connecteda conventional thermostatic device ||4 extending into the housingcontaining the rotary roaster 22 and the burner |00 so as to be operatedunder the influence of the heat in said housing to reduce the amount ofgas passing into and through the pipe ||0 when the temperature in thehousing containing the roaster and the burnerl rises above apredetermined degree, and to increase the amount of gas passing throughthe pipe ||0 to the burner when the heat within said housing drops belowthe desired degree. Thus, the valve I2 is automatically operatedindependently while the remaining mechanisms ofthe invention operate ina timed relationship, as heretofore indicated and as more specificallydescribed hereinafter.

The thermostatic valve is provided with a conventional setting device||5 whereby said valve .may be set or adjusted so that the thermostaticIvalve 02. A butterily valve H6 is rigidly attached to a rocking rod ||1extending across the pipe 12, and a butterily valve H8 is rigidlyattached to a rocking rod ||9 extending across the pipe I2. Anelectro-magnet has an elongated armature |2| operating through a guidelug |22 rigid with the pipe 12. y

Collars |22 are rigid on the armature |2| and have sliding pivotalconnection |24 with arms |25 attached to thc rods II1 and H9,respectively.

- When the electro-magnet |20 is energized, the

.and is compressed wheatne armature m is amature 2| is movedupwardly,thereby simultaneously opening thevalve ||8 and closing the valve llt.This permits the blower 12 to draw al1- through the pipe tland throughthe pipe 11,

with the results alreadye escribed, and prevents the blower 12 fromdrawing. air through the pipe 12. A spring |26 isyk |2| between the lugI2? d the upper collar |23,

closed and the valve ||0 is opened at the proper time after the coiieehas been'discharged from thev cooling compartment into the stonercompartment 15, so that the blower 12 will draw the coilee upwardlythrough the pipe 11 in the manner and with the results alreadydescribed.

'I 'he timing switch controlling the automatic electrical operation ofthe various electrical devices included in the invention is speclilcallyillustrated in Figs. l5, 16 and 1'1, and diagrammatically shown in Fig.18. The ground wire |21 of the electrical circuit has a connection |28with an annular terminal |20, and is constantly engaged by the brushlinger |2001 the switch unit |2| attached to an insulation support |22secured on a rotary spindle |22, which also supports a pointern |24cooperating witha time indicating dia1|38."The terminal |29 is attachedto an insulation support |28, as are the terminals |21, 40

|28, |29, |40, |4|, |42 and |42. The terminal |21y is engaged by thebrush finger |44; the terminals |00 and |29 are engaged alternately andintermittently by the brushnger the terminals |40, |4| and |42 areengaged successively` and intermittently by the brush ringer |46; andthe terminal l|42 is engaged intermittently by the brush finger |41; allof which are a part of the unit |2I. v 1

A synchronous motor y|48 connected with the electrical circuit of theapparatus rotates a small pinion |40 (Fig. 15) which engages and rotatesa relatively large gear |50 attached to the rotary spindle |32.' so thatsaid motor will rotate the brush switch unit |2| in a counter-clockwisedi` rection, as seen in Fig. 16.

The connections of the circuit wires to the various terminals arediagrammatically illustrated in Fig. 18, and are indicated by the samereference numerals that are applied to said terminals with exponents.as, for instance, the circuit wires are connected with the terminal |21through la connection |21', and so on. 'like motor I 40 is electricallyconnected with the terminal |21. l l

The hot wire IM through i'use connection |52 and fuse connection |52leads to and the motor |48 which rotates the switch unit |2l. The switch|4 controls the circuit tor operating the motor |42, so that said motorcan operate -m only when the switch |4 is closed and during the timethat the brush linger |44 lis in contact with the arcuate terminal |21.As shown, the terminal |21 has its ends separated by an interveningspace. The 'motor |40 will continue to operate so '.71

ted on the armature I wardly to their closed long as the switch I4remains closed. When the switch I4 is opened to -break the circuit, themotor |48 will continue to operate until the brush finger |44 movesintothe space between the ends of the terminal |31 and, at that time,the motor |48 will stop because there is no electrical energy suppliedthereto. As shown, al1` of the brush fingers |45, -|46 and |41 are outofcontact with their respective terminals when the brush finger |44. isout of -contact with the terminal |31 and is in the space between theends of said terminal, as a consequence of which the motor 98, alsocontrolled by the electrical circuit through the brush |44 and theterminal |31, will be stopped; and the conventional magnetic valve |54controlling the supply of fuel gas to the burner |08 through the pipe|55 will be closed. At this time, operation of all of the operatingparts of `the machine is automatically stopped because all of thebrushes other than the brush (Fig. 16) are out of contact with theirrespective terminals with which they cooperate. 'I'he machine will beautomatically stopped in this manner when all of the green coffee hasbeen discharged from the hopper 2, thereby permitting the lever I0 to beoperated by its weight I to open the switch I4, as heretofore described;or the machine may be stopped optionally by opening the switch I4 byturning the rod |6 manually.

ATo start the machine, a proper amount of green coffee is placed in thehopper 2 and is supported by the rods' 25. The weight of the green coieein the hopper 2 depresses the plate I and moves the lever that, when theframe I3 is turned by manual operation of the rod I6 to close theswitches I4 and I5, saids'witches will remain closed until all, orpractically all, of the green coffee has been discharged from the hopper2. When weight of the green coffee is removed from the plate 1, thelever I0 will be operated by the weight I| to open the switches I4 andI5, after which the machine will stop when the several brush lingers|44, |45, |46' and |41 have passed out of contact with their respectiveterminals, as already described.

After the hopper 2 has been filled with green coffee and the machine hasbeen started by closing the switch I4, the motor |48 rotates the switchunit |3| and first engages the brush iinger |44 with the terminal |31and next engages the brush finger |46 With'the terminal |42 which is incircuit with the electro-magnet 3| which withdraws the rods 25 fromacross the chute 22 and permits a charge or batch vof green coffee toenter the compartment 23. The brush finger |46 engages the terminal |42for only a short interval, just long enough to permit the desired amountof green coiee to enter the compartment 23, and then tact with theterminal |42, as a consequence of which the electro-magnet 3| isde-energized and the springs quickly operate in the manner heretoforedescribed to move the rods 25 in` positions in which they will supportthe green coffee in the hopper 2.

Next, after aV comparatively short interval, the brush finger |46 ismoved into contact with the terminal |4| and, at the same time, thebrush i'lngers |45 and |41 engage their respective terminals |39 and|43. i

When the brush finger |46 engages the terminai |4|, it closes theelectrical circuit to and energizes the electromagnet 63, which movesthe rack 6| toward the left, as seen in Figs. 12 and |0 away from thepart I2 so said brush finger passes out of con-- IAB, and thereby swingsthe. gate valve 41 to inclined position in which itextends into theroaster (Fig. 6) in approximate continuation of the inclined wall 5|, sothat any coffee contained in the roaster will be discharged therefrom,since the roaster is being rotated by its motor 08 and the flights 50 inthe roaster discharge the coffee onto the gate valve 41. At thesame-time that the electromagnet 63 is energized to move the gate valve41 to its inclinedkcoiee discharging position,.the motor 13 forA theblower 13 is operated through the ycircuit controlled by the brush |41and the terminal |43, creating a current or draft of air through thecooling compartment 52 to cool the roasted coffee, and thence throughthe blower,lbecause, at this time, the valve `|53 closes the pipe 82 andleaves the pipe 12 open'. At the same time, a lamp |56 in the upperportion of the cooling compartment l is lighted through the circuitcontrolled by the brush finger |45 and the terminal |39;y This lamp isprovided to permit inspection of the roasted coffee p which has one endattached to the armature 66.`

The ends of the spring |51 engage washers |59 and |60, respectively,loosely mounted on the rod |58. Nuts I6I and I62-attached to the rod |58engage the washers |59 and |60, respectively. The spring |51 is enclosedwithin a shell |63.

The washer |59 seats against a shoulder |64fand the washer |60 seatsagainst theend wall |65:

of the shell |63. When the electro-magnet 63 is energized and operatesthe rack 6| asv described, said rack moves'the rod |58 toward the leftas seen in Fig. 12, causing the washer |60 to compress the spring |51because the Washer |59 Vcannot move with the rod at this time.Therefore, when the electro-magnet 63 is deenergized as described, thespring |51 which had been compressed acts immediately to move the rack6| to its intermediate position in which `the gate valve 41 extendsvertically (Fig. 4) and then, the electro-magnet 65 having beenenergized by movement of the brush |46 into contact with the terminal|40, said electro-magnet 65 continues Y uninterrupted moi/@ment of therack 6| toward the right, as seen in Fig. 12, compressing the spring |51by the washer |59 and, at the same time, swinging the gate valve 41toinclined position (Fig. 5) in approximate alinement with the inclinedwall 40.

A switch |66 vmounted on a swinging support |61 controls the circuitI68to the electro-magnet 43 so that, when said switch the electro-magnet43 is unenergized. When the is open (Fig. 18),'

rod |58 is pushed beyondits intermediate position by the armature 66,said rod |58 moves the support I 61 far enough to close the switch I 66and thereby close the circuit |68v to the electromagnet 43, withthere'sult that said electromagnet is energized and its armature 42 ismoved upwardly. Upward movement of the armature 42 operates the arm 4|and thereby the valve 36 so as to swing said valve 36 to inclinedposition against the upper surface of the wall 40 and theupper surfaceof the gate valve 41. This causes or permits the green coffee to fiowfrom the com'- partment 23 along the inclined gate valves 36 and 41 intothe continuously rotating roaster 38. The gate v alves 36 and 41 areheld in the overlapping inclined positions (Fig. 5) described during thetime 'that the brush finger |46 remains in contact with the terminal I48. When the brush ngerL|46 passes out of contact with the terminal |48,the circuit to the electro-magnet 43 is opened, the armature 42 dropsdownwardly by gravity and closes the valve 36. At the same time, thecircuit to the magne-t 65 is opened and said magnet is de-energized.When the magnet 65 is de-energized, the spring |51 acts immediately andquickly to move the rod |58, and thereby the armature 66 and the rack6|, toward the left, as seen in Fig. 12, with the result that the switch|66 is moved by gravity or otherwise to vopen position, and with thefurther result that the rack 6| moves the gate valve 41 to its uprightor vertical intermediate position (Fig. 4) in which it prevents thecoffee contained in the continuously rotating roaster from beingdischarged from the roaster.

At this time, the cooling compartment 52 contains a batch of roastedcoffee that is being cooled by operation of the blower 13 drawing coolair through the cooling compartment and the coffee contained therein,and through the pipe 12.

After the roasted coffee contained in the cooling compartment 52 hasbeen cooled suiflciently, the brush ngermoves out of contact with theterminal I 39 and thereby opens the circuit to thelamp |56. Then, almostimmediately or after a very short time, the brush |45 moves into contactwith the terminal |38 and closes the circuit to the electro-magnets 18and 86 and to a lamp |69 located close to a transparent win-- dow (notshown) vin the pipe 11. When the electro-magnets 10 and 86 are energized(Fig. 4), their respective armatures 1| and 81 are moved upwardly.Upward movement of the armature 1| operates the lever 68 which moves thelower end wall 61 of the cooling compartment 52 downwardly to openposition and causes or permits the coffee to now from the coolingcompartment 52 into the stoner chamber 15. And, when the magnet 86 isenergized, it moves its armature 81 upwardly and thereby operates thelever 88 to move the valve 83 from the pipe 82 to the pipe 12. Thisprevents the blower 13 from drawing air through the cooling compartmentand through the pipe 12, and causes the blower to draw air through thepipe 82, the compartment 19 and the pipe 1,1, with the result that thecooled coffee which had been deposited in the stoner chamber 15 asdescribed is drawn upwardly through the pipe 11 and is dischargedagainst thefbafiie 88 and caused to drop into the lower part of thechamber 18 .while waste mattensuch as cha, etc., is drawn through thepipe 82 and discharged by the blower through the outlet 14. The suctionof the air through-'thepipe 82 cooperates with the weight 93' to holdthe closure'wall 98 in closed position at the lower end of the chamber18. l l

When the brush |45 passes o'ut of contact with the terminal |38, thecircuit tothe electro-magnets 18 and 86 and to the lamp |69 is opened,with the result that said magnets are de-enersized and the light of theThe armatures 1I and 81 then drop or move downwardly. 'I'he amature 1Ioperates'the lever 68 to move the closure wall 61 from open position(Fig. 4) to closed position (Figs. 5 and 6) prepatory to receiving andsupporting another batch lamp is extinguished.

of roasted coifee in the' cooling compartment. And the armature 81,whichmay be assisted by a weight 89 or equivalent device, moves downwardly tooperate the lever 88, andy thereby move the valve 63 from the'pipe 12(Fig. 4) to the pipe 82 (Figs. 5 and 6), thus opening the pipe "I2 andclosing the pipe 82.v At about the same time that the brush |45 movesout of contact with the terminal |38," the brush |41 moves out ofcontact with the terminal |43'and thereby opens the circuit to the motor13"and causes said motor to stop until about the time that another batchof roasted coffee is received within the cooling compartment 52. Whenthe suction through the pipe 82 and from the' chamber 18 is thusterminated, the weight of the coifee in said chamber-'18 may open theclosure wall 98 and cause or permit the coffee to flow from the chamber18 throughthe chute 4 into the bin 3. At this time all of the brushes|44, |45, |46 and AI41are out of contact with their respective terminalmembers and all of the circuits controlled therebyy a're open; so that,`at this time, if the switch I 4 visopen, the machine will stop. But, ifthe switch I4 remains closed, and it does remain closed when the plate 1As explained before, the switches I4 and I5 are mounted on the samemovable support I3, and are closed simultaneously and opened vsimulta-fneously by movement of said support from one position to another.. Theswitch I4 is in parallel with its/connected terminal members `|29 and|31, andthe switch I 5is in series ating terminal members |29 and |48.Therefore,

the mechanisms inthe circuit in which the switch I4 is mounted willcontinue to relationship until the brushes pass out of contact withtheir respective terminal operate in timed members |31, |43 and |38.But, when the switchl the circuit leading to the terminal `member |48vis opened and it is impossible to en- |5 is open,

ergize either of theelectro-magnets 43 or 65. As long as theelectro-magnet 43 remains unenergized, the valve v36 is held closed andno green coffee can. be discharged from the compartment 23 into theroaster, although the roaster continues to rotate until the motoroperating the same is stopped. Also, so long as the electro-magnet 65remains unenerglzed, as it does when the switch I5 is open, the rack 6Iwill not be operated thereby. 'I'his leaves the rack 6I in itsintermediate position in which the gate valve 41 is vertical. Thus, itwill be seen that the principal duty or function oi the switch i5 is toprovide for or assure that no green coffee will be discharged into theroaster when said switch is open, although the roaster will continue tooperate until thecoifee contained therein has been roastedanddischarged. Further, the switch I5,

' by controlling the delivery oli green coffee into' theroaster,yassures that no coifee will be con tained therein after the machine hasbeen idle as, for instance, through the night. Further, when the machineis again started after having remained idlefor a time, no green coifeewill be with its` cooperopened.

and, as seen in Fig. 14;: rotates in a. counterclockwise direction. Thenumerals from "0 to 18 contained on the dial represent minutes so on thedial, the gate valvefmember v to its outwardly inclined position inapproximate alinement with the inclined wall 40 ointhe compartment 23.and immediately thereafte'rlthe gate valve 36 is opened by the energizedelectro-magnet 43 and a batch of green coffee is discharged into thepreheated roaster 38. Thereafter, the

that, in the speciic arrangement shown; the machine operatesautomatically through the varl ious cycles,` heretofore described anduntil stopped 1 pointer ymakes one complete revolution in about fourteenand one-hal! minutes. Oil course, the dial operation `maybe varied andthe speed of rotation of the pointer may also be varied withoutdeparture from the invention; The pointer |34 (Fig. 14) isr at 0position and the brushes las, us and |41 have just contacted with theirrespective terminal members |39, |4| and |43. thereby discharging coiieefrom the roaster 33 into the cooling compartment 52 through the circuitcontrolled by the brush |40 and the terminal member |4|; starting themotor 13' for the blower 13 through the circuit controlled by the nnger|41 and the terminal member |43; and lighting the lamp |53 through thecircuit controlled vby the ringer |45 and the terminal member |33.

Considering that the pointer,(1ilg.'14') is rotating counter-clockwise,about the time that said pointer extends across the numeral u18 on theminute dial, the brushes |44, |45 and |41 move out oi contact with theirrespective terminal members |31, |33 and |43, thereby opening. thecircuits to stop the machine after the switch |4v has been But, i! theswitch I4 remains closed, the machine continues to operate through thedifierent cycles that have been described. 'Ihe ma- "L chine continuesto operate after the switch |4 has been opened until the brushes- |44,y|40 and |41 move out of contact with their respective terminal memberswhich, as stated, is at the time the pointer |34 extends across theminute desisnation' "18 on the dial. f/

By the foregoing operations, the roaster 38 has been emptied, the lastbatch of roasted collec the cooling compartment into the stoner cham ber15, and the blower 13 has caused the latch batch of roasted and cooledcoffee to be delivered into the chamber 13 while the valve 36 remainsclosed and supports a batch, or partial batch, of green coilee in thecompartment 23. Atv this time, all of the remaining circuits have beenopened and the pointer extends across the minute designation "18" on thedial. Also, at this time, the valve |54 has been closed to preventmovement of fuel gas through the pipe |55 to the burner |08.

When the machine is again started, the switch i4 is closed, therebyopening the valve |54` to permit the passage of gas through the pipe |50to the burner |08. 'Ihe gas at the burner |00 is ignited and the flameat said burner preheats the roaster 38 preparatory to receiving a batchci.' green coffee to be roasted. 5 At the same time that the valve |54is opened, the motor.98 is operated to rotate the roaster 38 and operatethe blower 0|; and the motor |43 is operated to rotate the unit |3| andthe pointer |34. Still consideringvthe pointer |34 (Fig. 14) as rotatingin a counter-clockwise direction from. its starting position across theminute designation 18, no green coffee will be discharged into theroaster 38 from the compartment 23 until the pointer has approximatelyreached the minute designation 1 on the dial. At about the time that thepointer |34 reaches the minute designation .1 .measured quantities ofconce in said compart- 75' n by one oranother ofthe expedients disclosedor suggested for that purpose.

It is now apparent that practically the only variable factor in theoperation of this machine is the variation in the amount of iuel Vgaspassing to the burner and the consequent variation in the degree of heatapplied to the roastcr by the burner. The supply of gas to the burner|03 through the pipe |55 is automatically controlled ,l

|34 with respect to the dial 35, the popping point may be noted and thesetting device ||5 may be moved to diierent adjusted positions to varythe amount oi' heat applied to the ro burner, and thereby'causediflerent nds of cof- 3/ ter bythe Y fee to pop after being contained inthe roaster the same length ottime. Thus, certain kinds of coee shouldbe contained in the roaster and heated for about three-quarters of acycle or ro` 1 tation of the pointer |34. When. the iirst batch oicoffee is delivered, into theroaster, the oper-K ator, by observing thedial, will note the point or time at which the coiee begins to pop andwill adjust the setting device ||5 accordingly so ,as to obtain what theoperator knows to be the best results. 1

The invention may be varied widely within the scope of equivalent limitswithout departure from the nature and principle thereof. I contemplatesuch equivalent variations as may be desirable, and what I claim anddesire to secure by Letters Patent is: A

1. In a coee roasting apparatus having a hopper, a rotary roaster, and acompartment.' for receiving coffee lfrom said hopper for delivery intosaid roaster; a gate valve for supporting coiee in said compartment, agate valve having an intermediate position for retaining coiee in saidroaster, and mechanisms coordinated for operating said gate valves intimed relationship in which said second gate valve is first moved fromsaid intermediate position to ya position to conduct cofiee from saidroaster and then to a position to conduct coiee into said roaster, andin which `said iirst gate valve is then moved to open positionoverlapping said second gate valve to conduct coilee from saidcompartment into said roaster and is then moved to a position to vclosesaid compartment, and said second gate r valve is vthen moved to saidintermediate position retain said collec in said roaster, 2. In acoffeeroasting apparatus having a hopper, a rotary roaster, a compartment forreceiv-` ing coffee from said hopper for delivery into said f roaster,and mechanism for delivering'measured quantities of coffee from saidhopper into said compartment; an element for supporting saidanisms, andadevice operated by the kweight ofy arcano* ment, a second element havingan intermediate position to retain conee in said roaster, coordinatedmechanisms for operating said elements in timed relationship in whichsaid second element is nrst moved from said intermediate position to aposition to conduct conee from said roaster and then to a position toconduct conee into said roaster', and in which said nrst element islthen moved to overlap said second element and to conduct conee from saidcompartment toward said roaster and is then moved to a positiontoclosesaid compartment, and said second element is then moved to saidintermediate position toretain said `conee in said roaster, and devicescontrolling said coordinated operation of said mechanisms. v ,A

3. In a conee roasting apparatus, 'a hopper for containing green conee,a rotary roaster having a combined inlet and discharge` passage,elements controlling delivery into said roaster o! measured quantitiesof green conee from said hopper, a device for guiding said green coneeinto and for discharging roasted conee from said roaster throughsaid-passage, rmechanism for rotatingA ysaid roaster, mechanismiorcoolingfand then cleaning the roasted conee discharged from saidroaster, electrical devices foroperating said elements and saidmechanisms. a switch controlling operation of said mechanisms, a pivotedelement supported by said hopper for operating said switch to andholding the same in open position to prevent operation of said elementsand said mechconeein said hopper for moving said last'named element toand holding the same in a position to permit said switch to be closedand remain closed when said hopper contains alpredetermined amount ofgreen conee. I i

4. In a `conee roasting apparatuspa rotary roaster having a combinedinlet and outlet opening, a gate supported at said opening for swingingmovements from an intermediate position to retain conee in said roasterto an inclined position into said roaster to conduct conee therefrom andto an inclined position away from said..

roaster to conduct conee into said vroaster and then to saidintermediate position, mechanism for opera-ting said gate sequentiallyto said several positions as aforesaid, and a nange in c oni nectionwith one edge oi` said gate preventing lodgment of conee beans betweenthe edgeljofv said gate and the wall of'said opening when said gate isin any of said positions. e

5. In a coffee roasting apparatus, a rotary roaster having a combinedinlet and outlet open-l ing, walls forming a receiving compartment forygreen conee to be delivered into said roaster, a valve for retainingconee in said compart-j ment, a gate. supported at said opening forswinging movements from an intermediate position to retain conee in saidroaster to an inclined position into said roaster to conduct-coneetherefrom and to' an inclined position away from said roaster to conductconee into said roaster and then to said intermediate position,mechanism for operating said gate sequentially to said several positionsas aforesaid, a nange in connection with oney edge of said gatepreventing lodgment of coffee beans between thel edgegfof.;.- said gateand the wall of said opening. when` said gate is in any of saidpositions, a hopper for containing green conee for delivery intosaidreceiving compartment, means for cooperatingy said valve with said gateto conduct conee from controlled'in part by green conee in said hopperfor controlling operation of said roaster and said gate.

compartment for receiving measured quantities of conee, a rotary roasterhaving a combined inlet .and outlet opening, a gate supported at said.

said roaster and then to said intermediate position, mechanism. foroperating said gate sequentially to said several positions as aforesaid,

a nange in connection-with one edge of said gate preventing lodgment ofconee beans between the edge of said gate and the wall of said opening`when said gate is in any of vsaid positions, a

hopper for containing green coffee for delivery into saidcompartment, avalve controlling discharge of conee from said compartment onto saidgate, mechanism controlled in part by green `conee in said hopper forcontrolling operation of said roaster and said gate, and manual meansfor controllingioperation oi' said mechanism to start and stop the same.

7. In* a Vconee roasting apparatusfa hopper, a' rotary roaster having aninlet opening for the passage of conee into said roaster, a gate valveat said opening movable to positions to conduct .6. In a conee roastingapparatus having a" conee into said roaster through said.n opening andto close substantially the openingduring the roasting of the conee insaid roaster and-to vconduct'the roasted conee from .said roaster, andcoordinated mechanisms vfor moving said gate svilctl'e to said positionsin proper sequences afore- 8. In a conee roasting apparatus, acompartment for containingconeer to be roasted and having an outlet, arotaryv roaster having an inlet opening for the passage 'of conee fromsaid outlet from said compartment intosaid roaster and for thefdischargeof roasted conee from said roaster,v a gatevalve at said openingmovableLto positions to conduct conee from said compartment -into saidroaster through said opening and then to close substantially saido'pening during the roasting of the conee in said roaster andthen toconduct the roasted conee yi'ro'nil ysaidrro'aster, an elementcooperating with said gate Vvalve for conducting cofi'eel from saidcompartment to said gate valve and for opening and closing said outlet,and coordinated mecharoaster, a gate valve at said opening movable tokpositions to conduct conee from said compartment'ini'o said roasterthrough said opening and fthen to close substantially said openingduring the roasting oi' the conee in said roasterl and then to conductlthe roasted conee from said roaster,

' an element cooperating with said gate valve for conducting conee fromsaid compartment to said gate valve and for opening and closing saidout-l iet, coordinated mechanism for moving said gate valve to saidpositions sequentially as aforesaid, and means connected with said gatevalve preventingthe lodgment of conee beans between 7s a margin ofl saidgate valve and a wall of said opening 10. In a coifee roastingapparatus, a rotary roaster,'mechanism for delivering into said roastergreen coffee to be roasted and lfor conducting roasted coffee from Vsaidroaster, a cooling compartment having reticulated walls and adapted toreceive the roasted coifee discharged from said compartment andsubsequently removing foreign substances from the roasted coifee anddischarging said foreign substances, means forming passages opening fromsaid roaster intosaid cooling compartment and communicating with theroasted coifee discharged from the cooling compartment respectively, andmechanism for open- I ing and closing said passages successively andalternately to cool the roasted coffee and to clean the'cooled coifeerespectively, as aforesaid.

11. yIn a coffee roasting apparatus, wallsform- Ying a compartment, arotary roaster supported in said compartment and having a combined lnletand outlet opening,va hopper adapted Vto con-` /tain green coffee,mechanism for conducting from I, ao

said hopper and into said roaster throughsaid opening greenV coffee tobe roasted and for discharging from said roaster through said openingthe roasted coffee, a burner supported in said compartment incooperative relation to said roaster, a pipe for'conducting fuel gas tosaid burner, mechanism having a partl extending into said roaster andcontrolled by the heat therein for controlling the amount of gas`passing through said pipe to said burner, and devices controlled by thegreen coffee in said hopper controlling delivery of coffee into saidroaster by said ilrs'tl mechanism and deliveryof gas to said burner,respectively.

12. In a coifee roasting apparatus, walls forming a compartment, a'rotary roaster supported .in said compartment and having acombined lnletand outlet opening, mechanism for conducting into said roaster'throughsaid opening green coffee to be roasted and for discharging from saidroaster through said opening the roasted coffee, a burner supported insaid compartment in'cooperative relation' to said roaster, a pipe forconducting fuel gas to said burner, mechanism having a part extendinginto said roastery and controlled by the heat therein forcontrolling-the amount of gas passingthrough said pipe to said burner,mechanismy for withdrawing` from `said compartment fumes and solidsdetached from the coffee being roasted, meansvfor separating the fumesfrom the solids after they have been withdrawn from said compartment.yand devices controlled by the green coffee in said hopper controlling'delivery of coifee into said t roaster by said kfirst mechanism anddelivery of gas to said burner, respectively.

13. In a coffee roasting apparatus having a roaster for roasting greencoffee, a cooling compartment, mechanism for discharging from theroaster the roasted co'ee and for conducting Vthe same into said coolingcompartment,. a stoner compartment having an opening communicating withsaid cooling compartment,. an element for closing said opening tosupport hotv roasted coffee in said compartment and to open said openingto permit coffee to pass from -said` cooling compartment into saidstoner compartment, a blower, pipe connections fromV V.said

avA` cooling current kof air through the coffee Lin said coolingcompartment and thenY to remove the cooled coffee from said .stonercompartment .and to discharge the lighter foreign particles".V`separated from said coffee, a hopper for supportblower to said coolingcompartment and to said b ing green coffee for delivery into saidroasterg, and mechanism-controlled by the green coffee` in said hoppercontrolling operation of said element and said blower and said rstnamed-mechanism. i

roaster;` a shoulder rigid withv one'of said walls l Y Y usV 14.A Inacoffee roasting apparatusfhaving a [coffee roaster, a hopperforgcontainin'g lgreen 4 coffee to be roasted, and walls forming apassage pf for yconducting coi'fee from said hopper to said*` mi 20V Yand extending inwardly therefrom into said pasl sage, a Yseries of rodsmovable through the wall opposite from said shoulder and having' freerods inwardly to position inwhich said Vpointed ends extendunder said.shoulder and outwardlyV therefrom to open said passage and permit green:coffee V.to pass from -said vhopper Athroughy said pointed ends, -andmechanism for moving said Y coffee tobevroasted, and walls i'ormingapassage for conducting coffee Yfrom said' hopper to said roaster; ashoulder rigid with :one of said walls Vv and extending inwardlytherefrominto said passage, a series of rods movableithroughthe Ywallopposite from said shoulder and having vfree pointed ends, mechanism formoving said rods inwardly to position in which'saidfpointed ends 40extend under said shoulder and. outwardly there? from to open saidpassage and permit green coilee topass from said hopper through .said ipassage toward said roaster, an element for sup-l porting green coffeeyin said passage prepara-vV tory fordelivery'into said roaster, andmeans for varying the amount ro1 coffee thatmay pass through saidpassage lto bevsupported by said element when said rods are movedoutwardly as aforesaid. Y

16. In a coffee roasting apparatus, a rotary' roasterfor receiving andcontaining coffee to be roasted, a burner for' applying heat kto saidroast# er to roast the coffee contained therein, a compartment adaptedto containva predetermined amount of green coffee"-prepieiratory fordischarge Itherefrom into said roaster and having an opening for thepassage of coffee from said compartment'toward said opening, an'elementfor closing said openingtofsupport coifeein said compartment, mechanismfor operating said ele'- ment to position to close said opening tosupport coffee in said compartmentand to position to disi charge .coffeefrom said. compartment in proper timed relationship, Amechanism foroperating said element to said positions to attain said functionssequentially, and. devices operated by said ele-V ment for preventingcoffee beans from lodging betweenv the edges of saidelement andadjacente portionsof said compartment, thereby leaving said elementfreelyI operative. Y

toA

17. In a coffee roasting apparatus having a roaster, and walls forming apassage opening into said roaster for conducting coffee into saidroaster; plates in said passage supported in spaced relationship fromtwo voppositely disposed ones of said walls, an element for opening andclosing said passage, flanges onA said element extending between saidplates and said walls when said element is in closed position'andpreventing lodgment of coffee partielesbetween the edges of said elementand said walls of said passage, and mechanism for operating said elementat predetermined intervals to open and to close said passage.

18. In a coffee roasting apparatus including mechanisms for roastinggreen coffee and then cooling the roasted coffee, and means controllingvthe delivery to said roasting mechanism of green coee tov be roastedand the subsequent discharge of roasted coffeeirom said roastingmechanism;

TME.

electrical mechanism for operatingthe aforesaid mechanisms and saidmeans, and switch means operated by green coffee supported for delivery'.to said roasting mechanism cooperating with said electrical mechanismand controlling operation of said electrical mechanism and causing saidelectrical mechanism to continue to operate said roasting mechanismuntil the final hatch of coiee is discharged from. said roastingmechanism and then to stop, thereby preparing said roasting mechanism toreceive another batch of green coii'ee after the apparatus has` beenagain started and the roasting mechanism has been preheated.

ALBERT C. WALDVOGEL.

